The sign of God is right in front of us - a baby in a manger.
The message of Christmas is first and foremost that God is always with you. Jesus was born in a broken-down barn, surrounded by animals, into a manger used as a feeding trough. He knows exactly what it means to be human.
Even when you think He is absent, He is present.
Christmas is about Jesus Christ and the sign in right in front of us.